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Hi Zide, I think I found the right way to reach my goal. I used the following command: clang -O3 -Xclang -disable-llvm-optzns main.c -S -emit-llvm -o main.ll to generate an IR file enriched by all the metadata that otherwise wouldn't be generated with -O0. Moreover, -disable-llvm-optzns flag ensure...

...et-dependent passes. However, when I use lli to execute bitcode generated by opt with -O3 or with the same optimization passes as -O3, the performance are still different. So, are there some special operations by -O3 option? I read the source code of opt, but I cannot find the reason. Best regards Zide At 2018-08-16 22:13:14, "Stefano Cherubin via llvm-dev" <llvm-dev at lists.llvm.org> wrote: Hello Emanuele, When you provide the optimization level -O3 to the clang driver, it does not simply schedule a sequence of passes to be run on the intermediate representation. Indeed, it...

Hello llvm-dev, my name is Emanuele and I am an intern in ARM. As part of the project I am doing here, I would like to manually replicate the optimizations that LLVM applies when I type -O3. In other words, I would like to know what are the compilation flags/passes that -O3 triggers. I noticed that GCC reports, on its website, all the flags that are enforced by -O3